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       #include <pthread.h>
       pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
       int    pthread_cond_init(pthread_cond_t    *cond,    pthread_condattr_t
       *cond_attr);
       int pthread_cond_signal(pthread_cond_t *cond);
       int pthread_cond_broadcast(pthread_cond_t *cond);
       int pthread_cond_wait(pthread_cond_t *cond, pthread_mutex_t *mutex);
       int   pthread_cond_timedwait(pthread_cond_t   *cond,    pthread_mutex_t
       *mutex, const struct timespec *abstime);
       int pthread_cond_destroy(pthread_cond_t *cond);
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